I was at the library and picked up a copy of Grateful Dead From the Mars Hotel and the liner notes talked about the Grateful Dead Wall of Sound that I read about in Rolling Stone in 1974. I did not see any of the Wall of Sound shows but you can read about the set up here: http://www.wallofsound.ws/
I did see the Dead at the Unidome in in 1978. It was a great show but I’m thinking the band musta been wondering how they got booked at the frozen tundra of an Iowa winter. You can read about that show here: http://gdnotebook.blogspot.com/2011/02/1978-02-05-uni-dome.html
I also have a copy of that show on Dick’s Pick Vol 18.
I gotta go…drivin that train